Health monitoring method of cable system based on strain monitoring during support settlement

Abstract

The invention discloses a health monitoring method of a cable system based on strain monitoring during support settlement, which is based on strain monitoring, and determines whether to update a mechanical calculation baseline model of the structure through monitoring a structure support coordinate; the mechanical calculation baseline model of the structure is updated only when the structure support coordinate changes, thereby a new mechanical calculation baseline model which is included in the structure of the structure support settlement is obtained, and a unit damage monitored-volume change matrix is calculated and obtained on the basis of the model. According to the approximate linear relationship between the current value vector of the monitored-volume and the initial vector of the monitored-volume, the unit damage monitored-volume change matrix, the unit damage scalar and the to-be-calculated current damage vector of the cable system, the non-inferior solution of the current cable damage vector can be calculated rapidly through the multi-objective optimization algorithm and other appropriate algorithms, accordingly, the location and the damage degree of the damaged-cable can be determined accurately during support settlement.

Description

technical field [0001] When there is support settlement, the present invention identifies the supporting system of the cable structure based on strain monitoring (referring to all load-bearing cables and all supporting rods that only bear tensile loads. For convenience, this patent refers to this type of structure as All the supporting parts of the system are collectively referred to as "cable system", but in fact the cable system not only refers to the supporting cables, but also includes the damaged cables in the rods that only bear tensile loads (for truss structures, it refers to the damaged cables that only bear Tensile load member), belongs to the field of engineering structure health monitoring. Background technique [0002] Cable-stayed bridges, suspension bridges, truss structures and other structures have one thing in common, that is, they have many parts that bear tensile loads, such as cable-stayed cables, main cables, slings, tie rods, etc. , cables, or rods th...

AI Technical Summary

Problems solved by technology

After the health state of the cable system changes, it will cause the change of the measurable parameters of the structure, such as the deformation or strain of the cable structure will change. In fact, the change of strain contains the health state information of the cable system, which means that the structure The health status of the structure can be judged by the strain data, and the damaged cable can be identified based on the strain monitoring (the monitored strain is called "monitored quantity" in the present invention, and the "monitored quantity" mentioned later refers to the monitored strain). In addition to being affected by the health status of the cable system, the monitoring quantity will also be affected by the settlement of the support of the cable structure (which often occurs). At present, there is no public and effective health monitoring system and method to solve this problem.

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